Unveiling the Journey of Gold: From Magma to Earth's Surface

Recent research from the University of Geneva has shed light on the mechanisms by which gold is transported from deep within the Earth's mantle to its surface. When tectonic plates collide, the subducting plate generates magmas rich in volatiles like water, sulphur, and chlorine. As these magmas ascend, they release magmatic fluids that bind with metals such as gold and copper, facilitating their journey toward the Earth's crust. The study highlights the pivotal role of sulphur, particularly in its bisulphide (HS⁻) form, in this metal transport process.

Utilizing innovative experimental techniques, the researchers replicated the high-pressure and high-temperature conditions of natural magmas. By analyzing synthetic magmatic fluids trapped within quartz at temperatures up to 875 °C, they determined that bisulphide is the dominant sulphur species responsible for mobilizing gold. This discovery enhances our understanding of the geochemical processes that concentrate precious metals and could have significant implications for mineral exploration strategies.

P. Geo. Ricardo A Valls, M. Sc. and Geo Gadfly
Valls Geoconsultant
Scopus Author ID: 7003369619/35335510700
ResearcherID: S-6604-2018